Method of mounting a deflection yoke assembly

ABSTRACT

A deflection yoke mounting assembly for semi-permanently mounting a deflection yoke in operative position on the neck of a cathode ray tube is provided. The assembly comprises an annular tube ring and a yoke retainer ring. The annular tube ring has first means provided for supporting the yoke retainer ring and second means distinct from said first means for use in bonding the tube ring to the rear wall of a cathode ray tube. The first means comprises four spaced apart studs which project from the tube ring and extend in a direction substantially parallel to the tube neck. The yoke retainer ring is provided with four hollow pockets which are aligned with the projecting studs of the first means. The second means also comprises projecting studs, generally at least two, which are hollow. The hollow portion communicates with an adhesive groove which extends interiorly about the internal circumference of the tube ring. This construction eliminates one previously utilized bonding operation in that it allows the tube ring to be positioned in its appropriate place upon the rear wall of the cathode ray tube and to be temporarily held in that position. The yoke retainer ring with a deflection yoke installed therein is then placed in position upon the supporting studs of the tube ring and the yoke retainer ring is then also temporarily held by adjustable means in this position. After appropriate signals have been applied to the tube and the deflection yoke so that its optimum position is determined, a single bonding operation can be performed. This is accomplished by inserting a hardenable adhesive simultaneously through provided ports within the hollow pockets of the tube retainer ring and through the hollow projecting studs of the annular tube ring. Thus, adhesive flows through the hollow studs and about the internal circumference of the annular tube ring effecting a bond between it and the rear wall of the cathode ray tube and the hardenable adhesive is also dispensed into the hollow pockets of the yoke retainer ring thus surrounding the projecting studs of the first means which are encompassed within the hollow pockets. An adhesive dispensing device having a suitable number of dispensing tips is desirable and can thus dispense the proper amount of adhesive in a single operation.

United States Patent 1191" Aldrich et al.

[ METHOD OF MOUNTING A DEFLECTION YOKE ASSEMBLY [75] Inventors: Floyd E. Aldrich, Waterloo; Fred A.

Hovey, Geneva, both of N.Y.

[73] Assignee: GTE Sylvania Incorporated,

Stamford, Conn.

221 Filed: Apr. 24, 1974 21 Appl.No.:463,540

Related U.S. Application Data I [62] Division of $61. No. 415,717, Nov. 14, 1974, Pat. No.

52 us. 01. 29/2513, 178/7.8 Y.

[51] Int. Cl.v H0lj 9/18 [58] Field of Search ..29/25.13;335/210,'212,

[56] References Cited UNITEDSTATES PATENTS I 10/1973 Deal ..l78/7.8 1/1974 Shrader.... ..l78/7.8

Primary ExaminerRoy Lake Assistant Examiner-James W. Davie v Attorney, Agent, or Firm-Norman J. OMalley; William H. McNeil]; Donald R. Castle [57] ABSTRACT -A deflection yoke mounting assembly for semipermanently mounting a deflection yoke in operative position on the neck of a cathode ray tube is provided.

11] 3,863,312 1451 Feb.4,'l975 ode ray tube. The first means comprises four spaced apart studs which project from the tube ringand extend in a direction substantially parallel to the tube neck. The yoke retainer ring is provided with four hollow pockets which are aligned with the projecting studs of the first means. The second means also comprises projecting studs, generally at least two, which are hollow. The hollow portion communicates with an adhesive groove which extends interiorly about the internal circumference of the tube ring. This construction eliminates one previously utilized bonding operation in that it allows the tube ring to be positioned in its appropriate place upon the rear wall of the cathode ray tube and to be temporarily held in that position. The yoke retainer ring with a deflection yoke installed therein is then placed in position upon the supporting studs of the tube .ring and the yoke retainer ring is then also temporarily held by adjustable means in this position. After appropriate signals have been applied to the tube and the deflection yoke so. that its optimum position is determined, a single bonding operation can be performed. This is accomplished by inserting a hardenable adhesive simultaneously through provided ports within the hollow pockets of the wheretainer ring and through the hollow projecting studs of the annular tube ring. Thus, adhesive flows through the hollow studs and about the internal circumference of the annular tube ring effecting a bond between it.

and the rear wall of the cathode ray tube and the hardenable adhesive is also dispensed into the hollow pockets of the yoke retainer ring thus surrounding the projecting studs of the first means which are encompassed within the, hollow pockets. An adhesive dispensing device having a suitable number of dispensing tips is desirable and can thus dispense the proper amount of adhesive in' a single operation.

' 1 Claim, 5 Drawing Figures PATENTED FEB 4191s S W A m P P A G W S N E P b D METHOD OF MOUNTING A DEFLECTION YOKE ASSEMBLY CROSS REFERENCE TO RELATED APPLICATION This application is a division of Ser. No. 415,717 filed Nov. 14, 1973, now US. Pat. No. 3,829,804.

BACKGROUND OF THE INVENTION This invention relates to cathode ray tube deflection yokes and more particularly to a mounting assembly for semi-permanently mounting a deflection yoke in operaproposed that a more suitable method would be to permanently or semi-permanently attach the deflection yoke to the cathode ray tube at the time the cathode ray tube is manufactured. It is with the latter method of mounting a yoke. that this invention is particularly concerned. The prior mounting practices involved establishing the position, in'the appropriate place, of an annular tube ring. The annular tube ring is generally of a plastic material and fits against the rear wall of the cathode ray tube in a position substantially surrounding the cylindrical projecting neck of the tube. The annular tube ring is provided with a hollow interior and has a pluraility of hollow projecting studs extending therefrom in a direction substantially parallel to the neck of the cathode ray tube. With the tube ring being held in its desired position a hot hardenable adhesive was forced through the hollows of the projecting studs and allowed to flow about the hollow interior of the tube ring. A suitable material will generally harden in 2 to 10 minutes. After the tube ring was mounted, a yoke retainer ring. also generally of plastic material, and having a deflection yoke mounted therein, was positioned to be mounted upon the annular tube ring. The yoke retainer ring was provided with a number of hollow pockets having an adhesive fill opening therein. The yoke retainer ring was held in a jig which allowed for three-directional movement; i.e., movement along an X, Y and Z axis. The hollow pockets surrounded the projecting studs and after appropriate signals were applied to the tube and the deflection yoke to determine its optimum position, a hot hardenable adhesive was forced through the adhesive fill openings in the hollow pockets and surrounded the projecting studs of' the tube ring. After hardening, the attaching jig could be removed and the yoke was left in a semi-permanently bonded position upon the cathode ray tube. While this procedure has worked well it has been quite expensive and time consuming in that at least two bonding or glueing operations were necessary. In view of the auto-. mated procedures generally employed in manufacturing plants this double glueing operation is not desirable.

OBJECTS AND SUMMARY OF THE INVENTION It is, therefore, an object of this invention to obviate .the disadvantages of the prior art.

Still another object of the invention is to provide a method of mounting a deflection yoke which employs only one glueing operation.

These objects are accomplished in one aspect of the invention by the provision of a deflection yoke mounting assembly which comprises an annular tube ring and a yoke retainer ring. The annular tube ring has first means for supporting the yoke retainer ring and second means distinct from the first means for use in bonding ,the tube ring to the rear wall of a cathode ray tube. The

employment of the separate and distinct means for attaching the tube ring to the rear wall of the cathode ray tube and for mounting the yoke retainer ring allows the use of a single glueing operation. The single glueing operation results in a savings of time, and a saving of operator cost.

BRIEF DESCRIPTION OF The DRAWINGS FIG. 1' is a rear elevational view of a prior art form of the invention;

FIG. 2 is also an illustration of a prior art form of yoke mounting;

FIG. 3 is a rear view of a cathode ray tube illustrating the invention;

FIG. 4 is an enlarged view partially in section showing in more detail the tube ring and yoke retainer ring of the invention; and

FIG. 5 is a diagrammatic perspective view of a hot adhesive dispensing head which can be employed with the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS For a better understanding of the present invention together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims in conjunction with the above-described drawings.

Referring now to the drawings with greater particularity, there is shownin FIGS. 1 and 2 a prior art mounting assembly. In FIG. 1 a cathode ray tube 10 is shown in diagrammatic elevation as having a rear wall 12 and a projecting cylindrical neck 14. Substantially surrounding the neck 14 is an annular tube ring 16. The ring 16 was provided with four projecting hollow studs 18. The hollows in the studs 18 communicated with the hollow interior of tube ring 16. When tube ring 16 was first mounted in position upon the rear wall 12 of tube 10, it was maintained in that position by some means such as a jig, not shown. A hardenable adhesive in fluid form was forced through the hollows in studs 18 in an amount sufficient to penetrate the hollow interior of tube ring 16 and under sufficient pressure to cause it to flow about the internal periphery thereof. After sufficient adhesive was inserted, it was allowed to harden thus bonding tube ring'16 to the rear wall 12 of tube 10.

Thereafter, a yoke retainer ring 20 which is formed of a plastic material having a circumferential wall 22 provided with a plurality of projecting hollow pockets rounded by the hollow pockets 24. For purposes of clarity, the yoke itself is not shown in FIG. 2. The hollow pockets 24 had a closed bottom portion 26 whichwas provided with an adhesive receiving aperture 28.-

' Again, the yoke retainer ring 20 was maintained in position by a suitable jig which is not shown. Afterthe optimum position of the yoke had been determined, a similar liquid, hardenable adhesive was forced through adhesive apertures 28 in an amount sufficient to substantially fill hollow pockets 24 and surround the encompassed studs 18. After a sufficient amount of adhesive had been dispensed it was allowed to harden. This prior mounting technique utilizing the prior assembly required two separate bonding operations. These separate bonding operations entail a good deal of time since it is necessary for each of the dispensed adhesive to harden before going on to the next step in the operation.

In order to obviate the above disadvantages, the mounting assembly shown in FIG. 4 is provided. Herein a tube ring 30' is formed with first means 32 for supporting a yoke retainer ring 34 and second means 36 for tinct from first means 32, comprise projecting hollowstuds 37. These hollow studs communicate with the interior of tube ring 30. To utilize the above-described assembly, the tube ring 30 is mounted in suitable position on the rear wall 12 of .the tube 10 and is maintained in that position as by a suitable jig. Yoke retainer ring 34 containing a yoke 38, which is shown diagrammatically and partly in section in FIG. 4, therein is then mounted in suitable position over the first means 32. The yoke retainer ring 34 is similar to that described in regard to the prior art and contains a circumferential wall 40 being provided with a plurality of projecting hollow pockets 42 which are shown in section in FIG. 4. The first means 32 are encompassed within the-hollow pockets 42'. Again, the hollow pockets have a closed bottom portion 44 as can be seen in FIG. 3 and are provided with adhesive receiving apertures 46. With tube ring 30 and yoke retainer ring 34 now mounted and held in position and the yoke position itself optimized, both units can be sealed simultaneously. This can be accomplished, by a single adhesive dispensing gun such as is shown diagrammatically in FIG. 5.

Herein, the adhesive dispensing gun 48 is shown as comprising an annular ring 50 which carries adhesive dispensing tips 52. In this instance six dispensing tips 52 are shown, four of which will dispense adhesive into adhesive receiving apertures 46 in hollow pockets 42 and two of which will dispense adhesive into second means 36. The simultaneous dispensing of the hardenable adhesive eliminates one of the prior art bonding operations and reduces the cost of the assembly. It also reduces the time necessary to complete the assembly since all of the adhesive is dispensed simultaneously and thus all of the dispensed adhesive will harden at substantiallythe same time. When hardened, the accompanying positioning jigs can be removed and the completed cathode ray tube with its semi-permanently bonded yoke will be ready for assembly into a television receiver.

While there have been shown what are at present considered to be the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.

What is claimed is:

1. In a method of mounting a deflection yoke assembly in operable relation upon a cathode ray tube having a rear wall and a cylindrical neck extending therefrom, the steps comprising: positioning an annular tube ring against said rear wall of said tube in a position substantially centrally located with respect to and surrounding said neck, said annular tube ring having a circumferential wall containing first means for supporting a yoke retainer ring and second-means for mounting said annular tube ring to said rear wall of said cathode ray tube, said first and second means being separate and distinct and projecting from said circumferential wall in a direction substantially parallel to said tube neck, said second means being formed with an adhesive passage which communicateswith an internal hollow groove formed in said tube ring; positioning a yoke retainer ring, having a circumferential wall containing a plurality of hollow pockets, over said tube neck so that said first means are encompassed within said pockets, said pockets having a substantially closed bottom containing an opening therein; and dispensing a hardenable adhesive simultaneously through said openings in said bottoms and said adhesive passages in said second means, whereby said annular tube ring is bonded to said rear wall of said cathode ray tube and said yoke retainer ring is bonded to said annular tube ring. 

1. In a method of mounting a deflection yoke assembly in operable relation upon a cathode ray tube having a rear wall and a cylindrical neck extending therefrom, the steps comprising: positioning an annular tube ring against said rear wall of said tube in a position substantially centrally located with respect to and surrounding said neck, said annular tube ring having a circumferential wall containing first means for supporting a yoke retainer ring and second means for mounting said annular tube ring to said rear wall of said cathode ray tube, said first and second means being separate and distinct and projecting from said circumferential wall in a direction substantially parallel to said tube neck, said second means being formed with an adhesive passage which communicates with an internal hollow groove formed in said tube ring; positioning a yoke retainer ring, having a circumferential wall containing a plurality of hollow pockets, over said tube neck so that said first means are encompassed within said pockets, said pockets having a substantially closed bottom containing an opening therein; and dispensing a hardenable adhesive simultaneously through said openings in said bottoms and said adhesive passages in said second means, whereby said annular tube ring is bonded to said rear wall of said cathode ray tube and said yoke retainer ring is bonded to said annular tube ring. 